Grinding-machine.



0. W. NILSON & F. A. BRASSILL.

GRINDING MACHINE.

APPLICATION FILED MAR. 6 l9.

Patentad May21,l918.

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MIDJDLIIETU, CDCTICUT, A COPTNERSHIP COMPOSED OF 050 W.

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hpplioation flied name a, ran.- semi Ito. mama v To whom t't'may Be it lmownthatwe, Oscar Wnennn N11.- son, a citizen of the United States, residing at Middletown, in the county of Middlesex t and State of Connecticut, and FRANK Anoisrous Bnassntn, a citizen of the United States, residing at Hartford, in the county pf Hartford and State of Connecticut, have Invented certain new and useful Improvelt ments in Grinding-achines, of which the follo' is a specification. invention relates to improvements in gun machines, and the object of our improvement is simplicity and economy in construction and convenience and efficiency in use.

lhu the accompanying drawing Figure 1 is a front elevation of our improved a m 1 machine.

Fig. 2 is a similar view of the supporting column and head, the bed-plate being turned 90 degrees on the column from the position It t sho in Fig. 1.

Fig.3 is a front elevation of the column. Fig. 4 isa'fraentary front elevation on an enlarged scae of a part of the column and ad]acent parts. i

Fig. 5 is a sectional view on the line a: m of Fig. 4.

improved grinding chine com or standard suported by a'base 11 andsurmounted by a 1- ed head 12 and av bed-plate structure 13 supported from the said 01 10 in 'a Special manner to be described.

The head 12 is securedon the upper en of the column 10 by bolts a pair of bearings 15 in spaced relation supportlng a shaft .16 on which is mounted a driving pulley 17 between the bearings 15 o and having ends overhanging the said bearin '15 for receiving the grinding wheels 18. he bed-plate structure 13 comprises the 1 upper plate 19 that serves as the bed-plate hill proper on which the work is secured in the usual manner, either directly or by means 1 of centers or a maetic chuck, not shown, and which features do not pertain to the present invention. a

The upper plate 19 is slidably'supported u or nmnnnrown, oonnnc'rrcur, i

Specification of Letters Patent.

plate 27.

14 and comprises- ]EK A. JBSSILJD, OF HART-- Patented May 21, 1121..

on an intermediate plate 20 and is moved longitudinally back and forth thereon by means of a rack and pinion feed operated by the hand "wheel 21.

v The intermediate plate 20 is slidably supported on the upper horizontal face 220i an angle-bed 23, suitably. to provide a transverse feed by means of a screw operated by the transverse feed hand wheel 24.

The angle-bed 23. comprises the horizontal face 22 on the upper end and a vertical operating face 25 at one side suitably channeled to slidably engage with the dovetailed guide rib 26 that constitutes the body portion of the vertical main supporting A vertical feed for the angle-bed 23 is provided b means of a screw 29 provided with a set 0 bevel gears .30 and operated by the hand wheel 31, which as'shown is mounted on astub shaft 32 and is directed at an angle of about 1 .5 degrees to the plane of the vertlcal plate 27. The shaft 32 is supported by a bearing '33 in one of the webs 34 that form the'side walls of the angle-bed 23.

The vertical, main supporting plate 2'1 is supported from a pair of trunnions 28 proided on the column 10 and spaced relation, by means of a split bearing composed of aplate member 41 securedto the plate 27 and a the beam The column 10 is'a cylindrical structure of substantial dimensions, and is reduced appreciably to provide two similar annular recesses that onstitute the trunnions28.

The plate ember 41 of the split bearing comprises in each case on the inner side a semieannular bearing ortion 36 that fits in the trumiion 28 and on the outer side has a pair of tangential arms 37 that combine tlli cap member 35 that serves to complete to form a transverse support for the main rear facev of the said main 27 by screws or bolts 40.

The cap member 35 is of semi-annular form, suitable to .complete the annular form of the slit hearing as mentioned, and is 'ecuredto the bearing pm'tion36 of the p to supporting plate member 41" by a plurality of screws 38, the

complete split bearing being of suitable di- .mensions to fit into and substantially fill the structure supported thereby can be swung completely around the column 10 and may be lockedin any desired position by means of the locking screw 39. g

When thus locked therein provision is made for vertical, transverse, and-longitudinal feeds for the bed plate and work supported thereto, and the structure is such that accuracy of the feed in the vertical direction as wellas the transverse and the longitudinalis insured.

Accordingly, as described, the structure is adapted for accuracy in grinding for either surface or cylindrical grindingr The double bearing as shown provides two cooperating thrust bearings for positioning the moving structure longitudinally relatively to the column or standard as well as providing a double bearing for rotative v movement.

It is to be noted that the two separate trunnions 28 are provided in a unitary, intelindrical supporting column extending upwardly from a base, a spindle supporting head on the upper end of the said column, a pair of trunnlons on the said column in spaced relation, bearings engaged with the said trunnions, and a bed-plate structure supported by the said bearings, the said trunnions being in the form of reduced portions of the said column, and the said bearings being in the form of split-bearings, fitting in the said reduced portions.

2. A grinding machine comprising a supporting column, a bed-plate structure supported from the said column, the means of support for the said structure from the said column comprising a pair of bearin in spaced relation, and the said column fiing reduced to provide a pair of bearing recesses to fit and to operatively receive the said bearings. I 3. In a grinding machine, a column having a base at the lower end and means for receiving a head at the upper end, the body portion of the said column being of cylindrical form andhaving a pair of annular recesses in the periphery in spaced relation suitably to receive bearing structures for supporting a bed-plate structure and each of the said annular recesses comprising a pair of radial end wall surfaces suitable for serving as thrust bearings and a cylindrical bearing portion connecting the said end Wall surfaces. 4

OSCAR WERNER NILSON.

FRANK ALOISIOUS BRASSILL.

Witnesses:

t FRED P. Bonn,

LOUIS M. SCHMIDT. 

